Efficient Caustic Rendering with Lightweight Photon Mapping
Different photon emission strategies in the CAR scene. We achieve a significantly better photon density inside caustics with fewer
photons. The emission directions and the number of light paths (and thus photons) are optimized automatically by our method.
Robust and efficient rendering of complex lighting effects, such as caustics, remains a challenging task. While algorithms like
vertex connection and merging can render such effects robustly, their significant overhead over a simple path tracer is not
always justified and as we show in this paper also not necessary. In current rendering solutions, caustics often require the
user to enable a specialized algorithm, usually a photon mapper, and hand-tune its parameters. But even with carefully chosen
parameters, photon mapping may still trace many photons that the path tracer could sample well enough, or, even worse, that
are not visible at all.
Pascal Grittmann, Arsene Pérard-Gayot, Philipp Slusallek, and Jaroslav Kĝivánek.
Efficient Caustic Rendering with Lightweight Photon Mapping.
Computer Graphics Forum (Proceedings of the 29th Eurographics Symposium on Rendering), 37(4): 133-142, 2018
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This work was supported by the German Research Foundation (DFG): SFB 1233, Robust Vision: Inference Principles and Neural Mechanisms, TP 2. It received further funding from the European Unions Horizon 2020 research and innovation program, under the Marie Sk³odowska-Curie grant agreement No 642841 (DISTRO) and was supported by the Czech Science Foundation grant 16-18964S and the Charles University grant SVV-2017-260452.